Edwardsville, IL (KSDK) - The Madison County State's Attorney's Office charged two parents in connection with the May drowning of their toddler son.

Deputies with the Madison County Sheriff's Department called to a small residential lake near Cherokee Trail in Edwardsville on May 2. Two-year-old Lukas Pinski was found floating in the lake by a teen, who dove in and pulled the young boy out.

Pinksi's grandmother, who'd been out looking for Lukas and his twin brother, called 911 and dispatchers walked her through CPR until deputies arrived. The boy was taken to a St. Louis hospital, but died a few days later. The other toddler was found safe.

An investigation by the sheriff's department found that Lukas and his twin brother were knowingly left unsupervised and escaped the house through a basement window, which they had done many times in the past.

Lukas' parents, 25-year-old Emilie Pinski and 26-year-old Thomas Pinski, were each charged with one count of endangering the life and health of a child. Thomas Pinski's mother, Shirley Pinski, and Emilie's mother, Rebecca Kennedy, were also charged with endangering the life and health of a child for allegedly allowing all five of the Pinski children to live in a home with human and animal feces, broken glass, debris and trash.

"That's why they are charged, that's why criminal charges are appropriate, these people knew what was going on they were all completely aware of the living circumstances and all completely aware of this danger," says Madison County State's attorney Tom Gibbons.

Neighbors like Nina Limbaugh are in complete shock.

"They were always friendly when I would see them which was very rarely," says Limbaugh who says the family lived there for a few years and says she's met one of the grandmas who also lives there.

Limbaugh was inside the Pinski's home right after the toddler died and said she saw nothing that's been described by the investigators.

The Pinski's four surviving children (two boys, ages 2 and 5; and two girls, ages 3 and 1) are in the temporary custody of the Illinois Department of Children and Family Services (DCFS).

If convicted, the felony child endangerment charge carries a sentence of probation or two to five years imprisonment. The misdemeanor charge of the same count carries a penalty of supervision or probation up to one year in county jail.